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.\" $FreeBSD: release/9.1.0/share/man/man9/vn_isdisk.9 147647 2005-06-28 20:15:19Z hmp $
.\"
.Dd July 9, 2001
.Dt VN_ISDISK 9
.Os
.Sh NAME
.Nm vn_isdisk
.Nd "checks if a vnode represents a disk"
.Sh SYNOPSIS
.In sys/param.h
.In sys/vnode.h
.Ft int
.Fn vn_isdisk "struct vnode *vp" "int *errp"
.Sh DESCRIPTION
The
.Fn vn_isdisk
function checks to see if
.Fa vp
represents a disk.
In order for
.Fa vp
to be a disk,
it must be a character device,
.Va v_rdev
must be valid, and the
.Vt cdevsw
entry's
.Va flags
must have
.Dv D_DISK
set.
.Pp
Its arguments are:
.Bl -tag -width ".Fa errp"
.It Fa vp
The vnode to check.
.It Fa errp
An integer pointer to store the error number in if the call fails.
.El
.Sh RETURN VALUES
If the vnode represents a disk, 1 is returned; otherwise, 0
is returned and
.Fa errp
will contain the error number.
.Sh AUTHORS
This manual page was written by
.An Chad David Aq davidc@acns.ab.ca .